#include <stdio.h>

int prime(int n)
{
	if(n%2==0)
		return n==2;
	if(n<2)
		return 0;
	int c;
	for(c=3;c*c<=n;c+=2)
		if(n%c==0)
			return 0;
	return 1;
}
 
int check(int n) {
  int p;
  for (p = 3; p <= n / 2; p += 2)
    if (prime(p) && prime(n - p))
      return 1;
  return 0;
}
int main() {
  int start = 6, end = 20000000;
  int n;
  long long x = clock();
  for (n = start; n <= end; n += 2)
    if (!check(n))
      printf("Congratulations!!,for %d the theory is Wrong!\n", n);
  long long y = clock();
  printf("%.3f second(s)!", (y - x) / 1000.0);
  return 0;
}
